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DIN 433

Plain washer,small series

Superseded by ISO 7092 (2000) · Still sold as DIN 433 · Sizes M1–M36
DIN 433 washer cut in half, with the thickness hDIN 433 washer cut in half, with the thickness h
Side view, in section
DIN 433 washer seen from its face, with the hole d1 and the outer diameter d2DIN 433 washer seen from its face, with the hole d1 and the outer diameter d2
Face view
Sized1 (mm, nom.)d2 (mm, nom.)h (mm, nom.)
M3
3.206.000.50
M4
4.308.000.50
M5
5.309.001.00
M6
6.4011.001.60
M8
8.4015.001.60
M10
10.5018.001.60
M12
13.0020.002.00
M16
17.0028.002.50
M20
21.0034.003.00
M24
25.0039.004.00

Values per ISO 7092:2000.

Verified data

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Calculators that use this standard: Tightening torque and screw loads · Bolted joint configurator

About DIN 433

What it is

The plain washer of the small series: same hole as DIN 125, smaller outside diameter, thinner. An M10 has a 10.5 mm hole, an 18 mm outside diameter and is 1.6 mm thick (DIN 125: 20 and 2 mm).

Where it is used

Under socket head and cheese head screws (DIN 912), whose heads are narrower than hex heads, from M1 to M36.

DIN or ISO

ISO 7092 replaced DIN 433-1. The washers are the same, except perhaps the M18: ISO gives it 3 mm thick, and some sources give 2.5 mm for DIN. ISO 7092 starts at M1.6; M1, M1.2, M1.4 and M1.8 are DIN only.

Typical mistakes

  • Drilling the plain counterbore for a DIN 912 with a washer. With DIN 433 an M10 needs 20 × 12.4 mm instead of 18 × 10.6.
  • Putting a normal-series washer in a counterbore sized for the small series: an M10 is as wide as that counterbore (20 mm).
  • Expecting the same M18 from DIN and ISO stock without checking: some sources give 2.5 mm thick for DIN, against 3 mm in ISO.

References